|Your description is poor.|
For most systems, a single pair of speakers must be amplified , switched on, not on minimum volume, and plugged into the green 1/8" jack.
CD and DVD drives have the built in ability to play regular audio CDs through the headphone jack on them if they have one - they don't need any software for that.
If you're getting no sound in Windows, you need to install the drivers for your sound chipset for the fancier audio stuff.
The video of video CDs should work.
Apparently your system was built by some relatively small company. I get no "hits" for Lex964341 and only a few for Lexicom. Did you type all of that correctly?
Where are you in the world??
No model specific info at any of these:
I'm assuming you have a desktop computer
Unplug the case/power supply.
Power off your monitor.
Open up the case by removing the left panel as seen when you're looking at the front of the case.
Find the model of your mboard and it's Version (e.g. V or Ver 1.x) or Revision (e.g. Rev or R 1.x) - sometimes the brand is there too - it's usually printed in obvious larger characters, often between the slots oir in the middle of the mboard